These are just some thoughts on the lens I reviewed below. I'd been meaning to post them earlier, but life gets in the way of a hobby sometimes.
The focus is easy to turn, too easy, there is a sense that the lens will fall out of focus when the camera shifts, but it hasn't happened, at least not yet. The advantage of the free turning focus is you can track a subject with just one finger, and support the lens with the rest of that hand, although I do not shoot video (and probably never will, such things require a completely different skill set) I suspect this lens would be ideal for such a task.
I will be posting more lens reviews in the coming month, starting with another 135mm lens.